RCL + ENTER + is the sequence for this. RCL * ENTER * for RCL* T. The entry sequence for stack registers is ENTER then the letter. We allowed a shortcut when things were unambiguous which turned out to be almost everywhere. Marcus added the . . shortcut for X later which is also handy but not applicable for Z or T in this situation.

The alpha layout when through quite a number of iterations and a lot of thought was put into it. The final layout isn't perfect but it was the best we came up with.